Excessive oil on the head is considered to be the result of excessive sebum secretion by the sebaceous glands in the scalp area, which leads to an increase in the thickness of the sebaceous film on the scalp surface, resulting in a very oily state. There are many factors that can cause excessive secretion of sebaceous glands, such as poor rest, lack of sleep, frequent late nights or frequent consumption of spicy and stimulating foods, and high secretion of androgens in the body may lead to thickening of the sebaceous film. If you want to improve the symptoms or carry out treatment, you need to choose selenium disulfide lotion. Psoriasis in the scalp area tends to lead to excessive oil secretion in the restricted parts of the scalp, and excessive oil will be accompanied by obvious flakes and scratchy punctate bleeding, which is an idiosyncratic erythematous skin disease. Eating too much greasy food can lead to temporary greasy hair, which is caused by temporary overproduction of sebaceous glands.